A fluorescence-detection size-exclusion chromatography-based thermostability assay for membrane protein precrystallization screening.

A fluorescence-detection size-exclusion chromatography-based thermostability assay for membrane protein precrystallization screening.
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DOI:
10.1016/j.str.2012.06.009
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发表时间:
2012-08-08
期刊:
影响因子:
5.7
通讯作者:
Gouaux, Eric
Gouaux, Eric
中科院分区:
生物学2区
文献类型:
--
作者:
Hattori, Motoyuki;Hibbs, Ryan E.;Gouaux, Eric

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Optimization of membrane protein stability under different solution conditions is essential for obtaining crystals that diffract to high resolution. Traditional methods that evaluate protein stability require large amounts of material, and are therefore ill-suited for medium- to high-throughput screening of membrane proteins. Here we present a rapid and efficient fluorescence-detection size-exclusion chromatography-based thermostability assay (FSEC-TS). In this method, the target protein is fused to GFP. Heated protein samples, treated with a panel of additives, are then analyzed by FSEC. FSEC-TS allows one to evaluate the thermostability of nanogram to microgram amounts of the target protein under a variety of conditions without purification. We applied this method to the Danio rerio P2X4 receptor and Caenorhabditis elegans GluCl to screen ligands, ions and lipids, including newly designed cholesterol derivatives. In the case of GluCl, the screening results were used to obtain crystals of the receptor in the presence of lipids.
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